21063014665 has 32 divisors (see below), whose sum is σ = 32281079040. Its totient is φ = 12809932800.

The previous prime is 21063014659. The next prime is 21063014683. The reversal of 21063014665 is 56641036012.

It is not a de Polignac number, because 21063014665 - 2⁵ = 21063014633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21063014665.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 651400 + ... + 682969.

It is an arithmetic number, because the mean of its divisors is an integer number (1008783720).

Almost surely, 2^21063014665 is an apocalyptic number.

It is an amenable number.

21063014665 is a deficient number, since it is larger than the sum of its proper divisors (11218064375).

21063014665 is a wasteful number, since it uses less digits than its factorization.

21063014665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334433.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 21063014665 in words is "twenty-one billion, sixty-three million, fourteen thousand, six hundred sixty-five".